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问题:
I'm trying to get an onClickListener to fire on a Spinner, but I get the following error:
Java.lang.RuntimeException is "Don't call setOnClickListener for an AdapterView. You probably want setOnItemClickListener instead,"
I'm sure I want to call onClickListener and NOT onItemClickListener. I found a question asked by someone else on Stack Overflow, Is there a way to use setOnClickListener with an Android Spinner?
The answer stated there is:
You will have to set the Click listener on the underlying view (normally a TextView with id: android.R.id.text1) of the spinner. To do so:
Create a custom Spinner In the constructor (with attributes) create the spinner by supplying the layout android.R.layout.simple_spinner_item Do a findViewById(android.R.id.text1) to get the TextView Now set the onClickListener to the TextView
I have tried the answer noted there, but it doesn't seem to work. I get a null pointer to the TextView after I do the findViewById().
This is what I'm doing:
Spinner spinner = (Spinner) findViewById(R.id.spinner); ArrayAdapter adapter = new ArrayAdapter(this,R.layout.layoutspinner,dataArray); spinner.setAdapter(adapter); TextView SpinnerText = (TextView)findViewById(R.id.spinnerText); if (SpinnerText == null) { System.out.println("Not found"); } else { SpinnerText.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { //Do something } }); }
File layoutspinner.xml
What am I doing wrong?
Per recomendation I tried this:
int a = spinnerMes.getCount(); int b = spinnerMes.getChildCount(); System.out.println("Count = " + a); System.out.println("ChildCount = " + b); for (int i = 0; i
But LogCat isn't showing promising results.
10-14 16:09:08.127: INFO/System.out(3116): Count = 7 10-14 16:09:08.127: INFO/System.out(3116): ChildCount = 0
I have tested this on API levels 7 and 8 with the same results.
回答1:
The following works how you want it, but it is not ideal.
public class Tester extends Activity { String[] vals = { "here", "are", "some", "values" }; Spinner spinner; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); spinner = (Spinner) findViewById(R.id.spin); ArrayAdapter ad = new ArrayAdapter(this, android.R.layout.simple_dropdown_item_1line, vals); spinner.setAdapter(ad); Log.i("", "" + spinner.getChildCount()); Timer t = new Timer(); t.schedule(new TimerTask() { @Override public void run() { int a = spinner.getCount(); int b = spinner.getChildCount(); System.out.println("Count =" + a); System.out.println("ChildCount =" + b); for (int i = 0; i
Let me know exactly how you need the spinner to behave, and we can work out a better solution.
回答2:
Here is a working solution:
Instead of setting the spinner's OnClickListener, we are setting OnTouchListener and OnKeyListener.
spinner.setOnTouchListener(Spinner_OnTouch); spinner.setOnKeyListener(Spinner_OnKey);
and the listeners:
private View.OnTouchListener Spinner_OnTouch = new View.OnTouchListener() { public boolean onTouch(View v, MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_UP) { doWhatYouWantHere(); } return true; } }; private static View.OnKeyListener Spinner_OnKey = new View.OnKeyListener() { public boolean onKey(View v, int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) { doWhatYouWantHere(); return true; } else { return false; } } };
回答3:
Whenever you have to perform some action on the click of the Spinner in Android, use the following method.
mspUserState.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_UP) { doWhatIsRequired(); } return false; } });
One thing to keep in mind is always to return False while using the above method. If you will return True then the dropdown items of the spinner will not be displayed on clicking the Spinner.
回答4:
Personally, I use that:
final Spinner spinner = (Spinner) (view.findViewById(R.id.userList)); spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView> parent, View view, int position, long id) { userSelectedIndex = position; } @Override public void onNothingSelected(AdapterView> parent) { } });
回答5:
First of all, a spinner does not support item click events. Calling this method will raise an exception.
You can use setOnItemSelectedListener:
Spinner s1; s1 = (Spinner)findViewById(R.id.s1); int selectionCurrent = s1.getSelectedItemPosition(); spinner.setOnItemSelectedListener(new OnItemSelectedListener() { @Override public void onItemSelected(AdapterView> parentView, View selectedItemView, int position, long id) { if (selectionCurrent != position){ // Your code here } selectionCurrent= position; } } @Override public void onNothingSelected(AdapterView> parentView) { // Your code here } });
回答6:
I suggest that all events for Spinner are divided on two types:
User events (you meant as "click" event).
Program events.
I also suggest that when you want to catch user event you just want to get rid off "program events". So it's pretty simple:
private void setSelectionWithoutDispatch(Spinner spinner, int position) { AdapterView.OnItemSelectedListener onItemSelectedListener = spinner.getOnItemSelectedListener(); spinner.setOnItemSelectedListener(null); spinner.setSelection(position, false); spinner.setOnItemSelectedListener(onItemSelectedListener); }
There's a key moment: you need setSelection(position, false). "false" in animation parameter will fire event immediately. The default behaviour is to push event to event queue.
